CIA Director David Petraeus resigns, cites extramarital affair

As first reported by NBC News and in a letter released to the CIA work force on Friday afternoon, Petraeus disclosed the affair, and wrote: "Such behavior is unacceptable, both as a husband and as the leader of an organization such as ours."

Petraeus told President Obama of his affair and offered his resignation during a meeting on Thursday, a senior official told NBC News. In a phone on Friday, Obama accepted the resignation.

In a letter released to the CIA work force on Friday afternoon, Petraeus disclosed the affair, and wrote: "Such behavior is unacceptable, both as a husband and as the leader of an organization such as ours."